The new EW-EC300 charging connector is designed specifically for Shimano’s 12-speed Di2 road drivetrains. Connected via the rear derailleur, it is also compatible with Shimano power meters.
THE SCIENCE OF SPEED: Shimano Di2 EW-EC300 Charging Connector
Charging of the new Shimano 12-speed Di2 road drivetrains is now accomplished with the EC300 charger cord. Attached to the rear derailleur, this new cord is less expensive than previous chargers and can also be used to charge Shimano power meters.
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